Thin place detector for looms



ocnzs, 1947;

J. H. CHAPMAN 2,429,804 THIN PLACE DETECTOR FOR LOOMS Filed Oct. 4, 1946 4 Sheets-Sheet l gvwwwbq u: .JOHN H. CHAPMAN Gamma;

Oct. 28; 1947.

J. H. CHAPMAN" 2,429,804

THiN PLACE DEI' ECTOR FOR LOOMS Filed Oct. 4', 1946 4 Sheets-Sheet 2 Oct. 2s, 1947. J, H, H MAN v 2,429,804

THIN .PLACE DETECTOR FOR LOOMS Filed 001;. 4, 1946 4 Sheets- Sheet 3 FIG-3" JOHN H. CHAPMAN Oct. 28, 1947. v J. H. CH PMAN 2,429,804

' v THIN PLACE DETECTOR FOR LOOMS Filed Oct. 4, 1946 4, Sheets-Sheet 4 FIG-5 JOHN H. CHAPMAN INVENTOR.

Patented Oct. 28, 1947 UNITED STATES PATENT OFFICE 2,429,804 THIN PLACE DETECTOR Fon LOOMS John H. Chapman, Central, S. C.

Application October 4, 1946, Serial No. 701,329 3 Claims. (01. 1391-348) This invention relates to a thin place detector for looms and more especially to a thin place detector which will not injure the cloth in the event that the detection does not stop at the loom.

It very often happens that in the types of thin place detectors heretofore used that the stopmotion mechanism of the loom will not be operated for some reason when the finger passes through a thin place in the cloth, and the loom will continue to operate, thus tearing the cloth and doing great damage to same until it is detected by an operator who can manually stop the loom.

In the present invention means are provided whereby a detector finger is pressed against the lower side of the cloth, and this detector finger slopes upwardly and forwardly in the direction of travel of the cloth, so that if it shouldfall into a thin place in the cloth and the circuit should not be completed or the stop-motion mechanism should not be operated, and the loom should continue to run, the cloth will ride past the finger and no damage will be done to the cloth as a result of failure to stop the loom upon the detection taking place.

It is, therefore, an object of this invention to provide a swingable finger disposed below the cloth in a loom, and this finger having a pointed upper portion extending upwardly and forwardly towards the cloth roll of the loom, so that in the event of failure to stop the loom after the detection of a thin place, the finger will not tear the cloth, but the cloth will ride past the finger with no damage whatever to the cloth.

Some of the objects of the invention having been stated, other objects will appear as the description proceeds when taken in connection with the accompanying drawings, in which Figure 1 is a side elevation of the front end of the loom and showing my invention attached thereto;

Figure 2 is an elevation with portions. in section and looking to the left from the right hand side of Figure 1;

Figure 3 is a top plan view of that portion of the loom shown in Figures 1 and 2, with certain portions being shown in section;

Figure 4 is an enlarged longitudinal sectional View through the detecting finger and its support to more clearly show the structure.

Figure 5 is a plan View similar to Figure 3, but showing the apparatus on the right-hand side of the loom.

Referring more specifically to the drawing, the numeral l0 indicates one of the side frames of the loom having a lower girt H on each side thereof, only one side of the loom being shown, and in these lower girts ll, there is disposed a conventional oscillatable rocker shaft [2 on which a pair of swords I3 is mounted, said swords suppivotally connected thereto and to the crank shaft, not, shown.

The loom also has a breast plate 2!} and a sand roll 2! and a cloth take-up roll 22, a shipper lever 23, a bracket 24 having a slot 25 therein, in which the shipper lever has sliding movement, said slot 25 having a notch 25 in one side thereof into which the shipper lever is placed for holding the .by means of a pivoted member 35 having a projection ,3! extending along the side the shipper lever 23. To the lower end of the member 30, which is pivotedat 34, is pivotally secured a dagger 35 which is adapted to be engaged by a hunter 35 on the lay of the loom for pivoting the number 3ilon its pivot 34 for knocking the shipper lever 23 from its notch 25 and stopping the loom. This number is oscillated by means of the dagger 35 striking bunter 36, and the dagger 35 is moved into the path of the bunter through the medium of a rod 31 pivotally secured to arm 38 of a magnet 39, said arm being pivoted as at 40, and hay: ing a portion thereof adjacent the core of a mag.- net 4!. Magnet 4! is supported in any conventional manner, such as by means of a bracket 43 secured to the frame of the loom.

The magnet 4| has leading therefrom a wire which leads to a battery or other source of current 5| and is grounded to the loom frame as at 52, which ground is usually the frame of the loom. Also leading from the magnet 4| is a wire 53, and these wires 5.0 and 53 are adapted to be connegted to a suitable warp stop-motion mechanism, not shown, for stopping of the loom on the breaking of a warp thread.

Wire 53 leads to a metallic contact 55 mounted on an insulation block 56, which is secured to a downwardly projecting portion 5'! of the loom. The warp threads are shown as at 50 and 6|, and a shed is formed by harnesses, not shown, and a shuttle is projected through the shed and the filling is beat up by the reed IE to form the cloth C which'begins as at 64.

In the event a thin place occurs in the cloth by a failure of the shuttle to pass a filling thread through the shed and failure of certain detecting mechanisms to detect this absence of filling, thus resulting in a thin place occurring in the cloth, it is the purpose of this invention to provide means for detecting this thin place and immediately stopping the 100m, and in case the stop-motion mechanism should not work, to prevent the detector from'injuring the cloth due to the continued operation of the loom.

On the breast beam 20 of the loom, by means of a bolt 10, is mounted a bracket 1 I, being slotted as at 12, and this bracket has a down-turned portion, slotted as at 65, and in this slot is mounted for vertical adjustment a'threaded portion 66 of a bushing Ha, which has, disposed therein a bushing 13 in which is oscillatedly mounted a shaft 14, which is confined in position Iclaim:

1. A thin place detector for looms employed for weaving cloth, comprising an oscillatable shaft disposed below the line of travel of the cloth, and having a finger secured thereon'and extending upwardly below the cloth, and having a pointed portion directed toward the line of travel of the cloth, said shaft having an arm secured thereto, a contact point disposed below the outer portion of the arm, the presence of,

cloth above the finger depressing the finger and I holding the arm in raised position, out of contact with the contact point, stop-motion means ping the loom when the arm engages said conagainst endwise movement by collars 15 and V finger 83 projects upwardly, rearwardly, and then upwardly and forwardly to a pointed end as at 85. The weight of arm 80 is greater than the weight of the finger 83, and therefore this tends to cause arm 80 to move downwardly to rest on contact member 55 when the finger 83 is not restrained against upward movement by the presence of woven cloth thereabove. The occurrence of a thin place allows the pointed portion 85 to pass through the cloth, and this allows the arm or rod, 80 to move downwardly andto contact member 55, close a circuit, energize magnet 4|, which places dagger in the path of bunter 3B, which will dislodge the shipper lever 23 from its notch 26 and cause it to move under suitable tension means, not shown, but which are conventional, to stop the loom,

. In Figures 1 to 4, inclusive, the invention has been shown as applied to the left-hand side of the loom. It is evident that this apparatus will work easily as well on the left-hand side of the loom as on the right-hand side of the loom, but in certain looms there might be loom parts which would, be in the way of installing it on the lefthand side of the loom. Figure 5 shows the apparatus installed on the right-hand side of the loom, and the structure is identical to that shown on the left-hand side of the loom, and like reference characters apply.

In the drawings and specification there has been set forth a preferred embodiment of the invention, and although specific terms are employed, they are used in a generic and descriptive sense only, and not for purposes of limitation, the scope of the invention being defined in the claims.

tact, said arm being permitted to engage said contact by a thin place in the cloth allowing said pointed end of said finger to move through the cloth.

2. Stop-motion means for a loom for stopping the loom when a thin place occurs in the cloth being woven by the loom, comprising a finger disposed below the cloth and normally engaging the lower surface of the cloth, an arm associated with said finger and tending to normally project the finger against the cloth, a contact disposed below said arm and adapted to be engaged by said arm when a thin place occurs in the cloth to allow the finger to pass through the cloth, a circuit leading from said contact, a magnet in said circuit, means controlled by the magnet for stopping the loom when a circuit is established through said arm and the contact point on which it rests, said finger extending upwardly and being bent in a direction in which the cloth is traveling, so that when the finger passes through a thin place in the cloth, and failure of stop-motion mechanism should result, the cloth will ride over said finger without damage to the cloth.

3. Stop-motion means for a loom for weaving cloth, comprising an oscillatable shaft having a finger projecting'upwardly therefrom, and having a pointed portion bent in the direction of the line of travel of the cloth when passing through a thin place in the cloth, an arm associated with said finger and adapted to be held in elevated position by the finger engaging the lower surface of the cloth, a contact point adapted to be engaged by said arm when the pointed end of the finger is allowed to pass through a thin place in the cloth, a magnet having means associated therewith for stopping the loom, and a circuit leading from said contact point through said magnet for stopping the loom when the pointed end of said finger passes through a thin place in the cloth to allow the arm associated therewith to engage said contact member.

JOHN H. CHAPMAN 

